Stamp-mill.



E, P. DARGIN.

STAMP MILL. APPLICATION FILED JAN. 31, 1910.

Patented 15610.21; 19,11.

y2 SHEETS-SHEET B.

\\ Ell. V

ERNEST P. DAB-GIN, 0F DENVER, COLORADO.

STAMP-MILL.

To all whom it may concern.

Be it known 'that ERNEST P. DARGIN, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Stamp-Mills; and l do declare the iollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying` drawings, and to the letters and iigures of reference marked thereon, which form a part of this specification.

invention relates to improvements in stamp mills in which the stamp is lifted through the action of a reciprocating cylinder containing two compartments in which are located pistons, one of which is directly connected with the stamp stem, while the other is connected with the said stem by ieans of rods extending above and below the cylinder and connected by yokes. In other words, the stamp stem may be said to be divided, its two members having pistons at their adjacent extremities and located on opposite sides of a partition centrally located in the cylinder. As the cylinder is moved upwardly, the air is com-4 pressed below both pistons and by the time the cylinder has reached its upward limit of movement the compression of the air above the two pistons is such that its expansion acting on the stamp stem through the pistons will cause the stamp to descend with greatly increased force, thus increasing the efliciency of the machine as compared with a stamp whose downward movement results from gravity alone. rlfhe cylinder slides vertically on guide rods which are securely connected with the stationary structure of the apparatus. rlihe rods which connect the two members of the stamp stem, pass through openings formed in lugs mounted on the opposite sides of the cylinder, the said lugs forming guides for the stamp stem rods. The reciprocating movement is imparted to the cylinder through the agency of side members connecting cranks, with which the operating shaft is provided, with trunnions formed on opposite sides of the reciprocating cylinder. The crank shaft is journaled in an opening half of which is formed in the top of the mortar block and the other half in the bottom of the mortar box, the block and the box being securely joined by means Specification of Letters Patent.

Application filed January 31, 1910.

Patented Feb. 2t, will( Serial No. 541,088.`

trated an embodiment thereof.

In this drawing: Figure l is a central vertical section taken through a stamp mill equipped with my improvements, the section being taken lengthwise of the operating shaft and on the line 1 1, Fig. 2.

Fig. 2 is a section taken at rightangles to the section in Fig. l, or on the line 2 2, Fig. l. Fig. 3 is a top plan view of the machine looking in the direction of arrow 8, Fig. 2, the parts being shown on a larger scale. Fig. 4 is a horizont-al section taken on the line 4 4, Fig. l, shown on a larger scale. Fig. 5 is a detail side elevation partly in section, of one of the side members employed to connect the operating shaft with the reciprocating cylinder. This view is obtained by looking in the direction of arrow 5, Fig. l, but shown on a somewhat larger scale. Fig. 6 is a section taken on vthe line 6 6, Fig. 2, looking downwardly,

the mechanism for rotating the stamp being shown on a larger scale. Fig. 7 is a section taken on the line 7 7, Fig. 6. Fig. 8 is a view looking in the direction of arrow 8, Fig. 10, the stamp stem and the connecting rods being shown in section. In this view the lower stamp stem yoke is illustrated. Fig. 9 is a section takenthrough one of the stamp stem pistons. Fig. 10 is a sectional View of the lower stamp stem yoke, the stem being shown in elevation.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate the stationary bed to which is secured the mortar block 6 upon which rests the mortar box 7, the block and box being secured together and connected with the bed by vertically disposed rods 8 which are four in number and pass through openings formed'in arms 9 with which the cylinder 10 is provided. This cylinder has an integral centrally located partition 12 dividing its chamber into upper and lower compartments which are closed by plates 13 and 14, respectively, which form parts of stuffing boxes 15 and 16 through which the stamp stem members 17 and 18 pass yand slide freely during the operation of the machine. Vithin the upper compartment is located a pistonl19 con- `Ystem member.

' beyond these blocks are fly wheels 29. The' shaft is further extended on one side as nected with the lower extremity of the upper stamp stein member; while within the lower compartment is a piston 20 connected with the upper extremity of the lower stamp The two stamp stem members Yare connected with each other by means of upper and lower yokes 21 and 22 which yare respectively mounted on they members V17 and 18 and connected by means of rods '.23 which pass through openings formedy in Vand below the yokes.

the yoke extremities, therods being secured in place by nuts 24 and 25 located above Apertured cylinder lugs 4 form guides for these rods. i

The operating shaft 26 is journaled in an opening formed partly in the bottom of the mortar box and partly in the top of the'inorvtar block.` Its extremities or end members 27 are journaled in bearing blocks 28 while vshown at 30 and to thisextremity an operating pulley 31A is secured. Between the bearing blocks 28 and the mortar block and `inortar box, cranks 31 areforined in the ,Y operating shaft and these cranks are connected by means of members 32 with trunnions- 33 connected with the opposite sides of the cylinder 10 by'nieans of bolts 34.

These trunnions are provided with members l35 extending both above and below the trunnions proper Vand groo-ved to receive tongues 36-with which the opposite sides of the cyly Yinder are provided. These trunnion extenf sions 35 are provided with openingslon opposite sides ofthe groove which register the trunnions are securely attached to the` with openings formed in the cylinder tongues 36. Aseries of bolts 34 is passed through these registering openings, whereby cylinderand at the same time are made ydevder is preserved.

`boxes 38 which connect the said members Ywith the trunnions 33. The connecting members 32 are each composed of two rods 39 which are connected with the members of the bearings 37 by nuts 40. The members of t the upper boxes 38 are connected with each otherby means of bolts 40A.

These boxes ,are supported upon the rods 39 by nuts 41 located on the rods below the boxes.

other suitable material.

These 'rods extend above the boxes 38 and upon them are mounted spiral springs 42 whose lower extremities engage the upper box members while their upper extremities bear against nuts 43 mounted on the upper extremities of thek rods 39. 1n order to stiffen the rods 39 of each connecting inember 32, castings 44 are mounted on the said rods lbeing supported thereon by nuts 45 which are properly regulated so that the connecting members 32 are correspondingly arranged on both sides of the machine. It is important that these members 44 shall be arranged to harmonize as regards their vertical location upon the two connecting members and in order to facilitate their proper adjustment, a graduated gage rod 46 is connected with the upper box 38 and extends downwardly into a central opening 47 formed in each member 44. By virtue of the graduated feature of these gage rods, it becomes practicable to accurately adjust the members 44 to harmonize as to vertical location. l

Mounted on the guide rods 8 approximately midway' between their extremities is a plate48 having arms 49 through which the rods 8 pass, the said arms having perforatioiisfor the purpose. These arms engage similar arms 51 mounted at the uppei' extremity of the stamp mill casing 52. This plate 48 is provided with a recess 52 having a toothed bottom, the teeth coperating with those of a loose disk 53 held in engagement with the teeth of the plate by a spring 54. On this loose toothed disk 52 is located a pin or dog 55 which engages a spiral groove 56 formed in the stamp stem. In the construction shown` in the drawing, as the stamp steininoves upwardly, the disk is turned since the teethv of vthe two members are so arranged as to permit this result. However, during the downward movement, the disk is locked againstrotation by virtue of the arrangement of the teeth of the cooperating members and consequently the stamp is given a partial rotary movement during its downward travel.

rlhe lower extremity ofthe stamp stem is equipped with a body member 59 having a removable shoe 60 adapted toengage a die 61 with which the mortar box is provided. The mortar box is circular interiorly and provided with a lining 62 of sheet steel or Above the mortar box the structure is equipped with screens 63 having Va mesh corresponding with the ineness to which the pulverized material is to be reduced before escaping from the mortar. 1n the bottom of the mortar box the die 61 cooperates with theshoe in performing the pulverizing function.

`The guide rods 8 extend above the cylink der and their upper extremities are connected by a rectangular frame member 65 which is reinforced at each corner, as shown at 66, and perforated to receive the said rods, which are four in number.

Referring again to the reciprocating cylinder l0, it is important that its wall contain ports 67 communicating with its upper and lower compartments, the latter being respectively designated by reference characters (38 and 69. Assuming now that the stamp is at its downward limit of movement as shown in Fig. l, as the cylinder begins its upward stroke, the stamp stem and the pistons 19 and 20 will not move instantly and consequently the lower ports G7 4of both cylinder compartments 68 and G9 will be immediately covered by the pistons and the air which at the beginning of the upward stroke of the cylinder is of normal atmospheric density, will be compressed below both pistons, and this pressure will attain such a degree before the upward move-- ment of the pistons can attain the speed of the cylinder that the expansion of the air will drive the pistons upwardly at a greater speed than the movement of the cylinder, whereby the parts, when the stamp is at its lupward limit of movement (see Fig. 2) will occupy approximately the position shown in the last named figure. It is evident that as soon 'as the pistons pass the upper ports (57 of their respective compartments, the air will be compressed between the upper piston and the upper extremity of the cylinder and between the lower piston and the partition l2 of the cylinder; and by the time the pistons reach their upward limit of movement, the pressure of the air in the upper extremities of the two compartments will be such that its expansion will act to drive the stamp and its attachments downwardly with a force greatly in excess of that which could be obtained by gravity. It is evident that before the stamp has reached its upward limit of movement, the lower ports of the two compartments 68 and 69 will be uncovered, thus allowing1 the air originally compressed therein to escape or become reduced to normal atmospheric pressure, whereby there is practically no resistance to the downward movement of the stamp incident to the travel of the pistons downwardly within their respective compartments.

By virtue of the fact that the operating shaft 9.6 of my improved stamp mill is journaled in the base of the structure and directly below the mortar, the power is advantageously applied for stamp operating purposes and the structure is confined within small compass which is an important advantage. Furthermore, the solidity of the structure in which the operating shaft is journaled is an important feature.

In order to facilitate heat radiation, the cylinder l0 is provided exteriorly with relatively deep corrugations or teeth forming a comparatively extensive radiating surface for the dissipation of the heat resulting from the friction due to the reciprocating action of the cylinder and the air compression therein, as heretofore explained. This corrugated or toothed construction is indicated by the reference letter A in Figs. 3 and t.

Having thus described my invention, what l claim is:

l. ln a stamp mill, the combination with a stamp, of a divided stamp stem having pistons at its free extremities, the stamp stem members being connected to move in unison, and a cylinder' mounted to reciprocate and having two compartments in which the respective pistons of the stamp stem members are located, the cylinder compartments having ports for the purpose specified, and means for reciprocating the cylinder, whereby the same is actuated, substantially as described.

2. A stamp mill, comprising a stamp, and a divided stem connected with the stamp, the stem members being each equipped with a piston, a cylinder having two compartments in which the respective stamp stem pistons are located, the stamp stem members being connected together outside of the cylinder, and means for 'reciprocating the cylinder whereby the stamp is operated, substantially as described. A

3. A stamp mill, comprising a stamp, a stamp stem composed of two members having their free extremities equipped with pistons, a cylinder mounted to reciprocate and having two compartments in which the pistons of the stamp stem members are located, each cylinder compartment having ports, for the purpose set forth, and means for reciprocating the cylinder, substantially as described.

4;. A stamp mill, comprising a stamp, a stamp stem composed of ltwo members terminating at their free extremities in pistons, a cylinder having two compartments in which the pistons of the respective stamp stem members are located, a connection between the two stamp stem members consisting of yokes connected with the respective members above and below the cylinder, and rods connecting the yokes causing the two stamp stem members to move in unison, the cylinder being mounted to reciprocate, stationary guide rods for the cylinder, and means forv reciprocating the latter, substantially as described.

5. A stamp mill, comprising a stamp, a stamp stem composed of two members having their free extremities equipped with pistons, a cylinder having two compartments in which the respective pistons of the stamp stem members are located, the cylinder having `trunnions on opposite sides, an operat- Ving shaft having' cranks, and members lo# lcip'rocating thelatter, substantially asidescribed.

6. A. stamp `mill, comprising a Sta-mp, a

stamp stem composed of two'members whose free extremities terminate in pistons, a cylinder having compartments 1n which the v respective pistons of the stamp stem members areirlocated, a connection' between the stamp stem members comprising yokes'atf tached to the said v members above and below thepcylinder, and rods connecting the said yokes, the cylinder havingV perforated guide lugs through which the rods pass, trunnions located on opposite sides of the cylinder and having parts extending in both directions from the trunnions and groovedjto receive. tongues with which the opposite sides of the cylinder are equipped, bolts fory connecting the tongues-cf the cylinder with the grooved members of the trunnions, an operating shaft having cranks, and members connecting the said cranks with the trunnionsof the cylinder for operating purposes, substantially as described.

7. A stamp mill, comprising a stamp, a divided stamp stem, pistons with which the stem members are equipped, a cylinder having compartments in which the `pistons are located, a rigid connection between the `stamp stem members, including rods lo- 'cated outside of the cylinder and passing 'the cylinder trunnions, the said connecting members each consisting of a pair of rods, and a casting centrally mounted thereon for strengthening purposes, substantially as described.

8. In a stamp mill, the combination With a stamp, of a divided stamp stem, the two stamp stem members terminating in pistons, a cylinder having compartments in which the said pistons are respectively located, a

connection betweenv the stamp stem members, includingrods located outside of the cylinder, the latter, however, being equipped with perforated guide lugs through which the said rods pass, means for reciprocating the cylinder whereby the stamp is operated, and means for imparting partial rotary movement to the stamp stem during each reciprocation, substantially as described.

In testimony whereof I aiix my signature in presence of two witnesses.

ERNEST P. DARGIN. Witnesses Jnssrn F. HoAn'r, ALBERT OBRIEN. 

